Verse 31

धावमानमधो मत्तं चित्तं विमलमाकुलम् ।बलात्संरोधयामास सेतुर्जलमिव द्रुतम्

In plain words

The citta — running downward, maddened, stainless in itself yet turbulent — he forcibly restrained, as a dam holds back rushing water.